C 1500 Truck 2WD V8-350 5.7L (1989)
Transfer Case Actuator: Customer Interest
Transfer Case - Self-Engagement Into 4-Wheel Drive
Number:
89-233-4C
Section:
4C
Date:
August 1989
967403 Corporate Bulletin No.:
Subject:
TRANSFER CASE ATTEMPTED "SELF-ENGAGEMENT" INTO 4-WHEEL DRIVE
Model and Year:
1989 K3 TRUCKS WITH R05 (DUAL REAR WHEELS)
TO:
ALL CHEVROLET DEALERS
Some 1989 K3 trucks with dual rear wheels may experience a transfer case condition which may be described by the operator as "self engagement." The
condition occurs as the vehicle is being driven in two-wheel high. The driver may comment that the four-wheel drive indicator lights up and the front
axle tries to engage. Typically, this condition is temporarily corrected if the transfer case is shifted into four-wheel drive and then back to 2-HI. The
cause of this condition has been identified as the transfer case switch, which may become pressurized during temperature increases and can close the
switch contacts.
Figure 1
